Roller mill



R. T- F. DODDS ROLLER MILL Filed Nov. 24, 1922 Patented July 8, 192

ROWAN T. F. DODDS, 0F W'ELLAND, ONTARIO, CANADA.

ROLLER- MILL.

Application filed November 24,1922. Serial No. 602,932.

To all whom it may concern:

Be it known that I, ROWAN T. F. Donns, of Welland, in the county of Welland, Province of Ontario, Canada, a citizen of the United States of America, have invented certain new and useful Improvements in Roller Mills, of which the following is a specification.

This invention relates to roller-mills of the type shown and described in my prior United States Letters Patent No. 1,218,933, dated March 13th, 1917, and my object is to improve the construction of the frame to 1 facilitate assembly and the placing or removal of the rolls and to improve the ad justing means for the rolls.

I attain my object by means of the con structions hereinafter described and illustrated in the accompanying drawings in which Fig. 1 is an elevation of the head end of my improved mill;

Fig. 2 a horizontal section on the line 22 in Fig. 1;

Fig. 3 a side elevation of Fig. 1; and

Fig. 4 a front elevation of the lower part of one of the end frames of the head end of the mill.

Fig. 5 a front elevation of the upper part of one of the end frames of the head and of the mill.

In the drawings like numerals of letters indicate corresponding parts in the different figures.

In the drawings 1 illustrate only the head end of the mill containing the rollsfthe rear part of the mill being substantially of known type, such, for example, as illustrated in my prior United States Patent No. 1,218,933.

The head end of the mill is formed with end frames constructed substantially as follows. Each end frame comprises a lower portion 1 provided with a substantially rectangular narrow central projection 2 at its upper end, formingn notch at each side and also with inwardly extending gaps 3 adjacent its lower end, the gaps and the lateral notches formed through the up. ard projection 2 being substantial equivalents in enabling the rolls to be positioned without disconnecting the end frames.

The lower parts 1 of the end frames are formed of metal and are connected by means of stays d, which have their ends reduced in diameter to form shoulders 5, the ends 6 being threaded and passing through holes formed in the end frames. On these ends 6 are screwed the nuts 7. The end frames are thus securely and detachably connected.

The rolls 8 are connected to spindles 9 and these spindles are journalled, usually by means of ball bearings, in brackets 10 and 11. The brackets 10 support the inner .rolls of both the upper and lower sets and are bolted respectively to the bosses 12 formed adjacent the lower end of the projecting part 2 of the frame and adjacent the inner ends of the gaps 8. The bearings 38 of the inner rolls it will be noted are split so that in removing the rolls only the top parts of the bearings need to be removed. The brackets 11 are swingable to adjust the outer rolls to and from the inner rolls, being pivotally mounted on bosses 13 formed ad'- jacent the gaps in the frame.

To adjust the brackets 11 I provide the following mechanism for each bracket. Bosses 14 are provided in each end frame and on each boss is journalled an eccentric 15 suitably formed for engagement with a wrench. A rod 16 is provided with an eccentric strap engaging the adjacent eccentric. This rod passes through the upper end of the corresponding bracket 11" and has an adjustable collar 17 threaded thereon provided with a suitable lock nut. Inthe bracket is formed a recess surrounding the rod and in this recess is located a coil spring 18, which also engages the collar. The tension of this spring acts against the bracket and tends to press the roll carried thereby towards the inner roll. The tension of the spring may be adjusted by adjusting the collar.

A lug 19 is formed on the bracket and through this is threaded an adjusting screw 20 provided with a hand wheel 21. The inner end of the screw is formed with a conical recess to engage the coned end of the rod 16.

It is evident that by adjusting the hand wheel that the nearness of approach of the movable roll to the fixed roll be set, while the springs permit the movable roll to yield if necessary to prevent damage to the rolls.

The upper part 22 of each end frame is formed separate from the lower part, and these upper parts serve to support the hoppers and complete the enclosure of the working parts as far as the ends of the frame are concerned. Gaps 23 are formed at each side of each of the upper frame parts 22. Through the gaps 3 and 23 the spindles 9 of the rolls may be passed sideways. In setting up the machine the spindles are suitably positioned in their corresponding brackets and the parts are positioned by passing the spindles sideways through the gaps until the brackets come into proper position to be connected to their appropriate bosses in the end frames. If at any time the rolls require to be removed, the process is reversed.

It will be understood, of course, that as far as the adjustable brackets are concerned,

the connections of their adjustments are made after the brackets have been positioned and must be disconnected before the adjustable rolls are removed.

- The spindles of suitable rolls are at the outer end of the head end of the machine provided with pulleys 24:. Round these pulleys passes a belt 25, which also passes round a pulley 26 secured to the drive shaft 27, which is journalled in bearings carried on a bracket 28 secured to the outer end frame 1 and in bearings carried on a yokeshaped frame 29 secured to the end frame. A drive pulley 30 is secured to the outer end of this drive shaft. At its inner end the drive shaft 27 is provided with a gear pinion 31 connected with a gear wheel 32 fast on the shaft 33 j ournalled in bearings carried by brackets 34 secured to, the end frames. This shaft 33 is used to drive the mechanism of the tail end of the machine, which is not shown as it forms no part of the present invention.

Below each pair of rolls is located a rotary conveyor 35, the spindles of these conveyors being journalled in bearings carried by brackets 36 secured to. the end frames. Each conveyor spindle has a pulley 37 secured thereto, which pulleys engage a belt 38, which also passes over a pulley 39 secured to the drive shaft 27.

It will be noted that the arrangement of the drive for the rolls and conveyor shafts is well known in the art and no claim is made thereto, the present invention relating only to the construction of the end frames for the purpose of facilitating the placing and removal of the rolls and means for adjusting the same.

l/Vhat I claim as my invention is 1. In a roller-mill, end frames of metal each formed with an integral upward extension at the middle of its upper end; brackets for the spindle bearings of grinding rolls secured to the frame adjacent the angles between said extension and the upper end of the frame; and brackets for complementary grinding rolls pivoted on the main part of the frame adjacent the top of the lower part of the frames at each side of the extension.

2. In a roller-mill, end frames of metal each formed with an upward extension at the middle of its upper end and a gap at each side adjacent its lower end; removable bearings for the spindles of grinding rolls secured to. the end frames adjacent said gaps; brackets for the spindle bearings of grinding rolls secured to the frame adjacent the angles between said extension and the upper end of the frame, brackets for complementary grinding rolls pivoted on the main part of the frame adjacent the top of the lower part of the frames at each side of the extension.

3. In a roller-mill, end frames of metal each formed with an upward extension at the middle of its upper end; brackets for the spindle bearings of grinding rolls secured to the frame adjacent the angles between said extension and the upper end of the frame; brackets for complementary grinding rolls pivoted on the main part of the frame adjacent the top of the lower part of the frames at each side of the extension; and a wooden top extension of each end frame having gaps formed at each side for the passage sideways of the roll spindles.

Signed at city of Welland, Ontario this 23rd day of October 1922.

ROWAN T. F. DODDS. 

